Titanosaurus was cut from Godzilla: Save the Earth. This was due to licensing errors, so Megaguirus took Titanosaurus' place. He can still be seen in the concept art though, wading in the water of an icy level. Titanosaurus appears as a playable character in Godzilla: Unleashed.

"Titanosaurus is a prehistoric throwback-a primitive monster from an ancient age who has managed somehow to persist in contemporary times. Titanosaurus lives deep in the ocean, hibernating for hundreds of years in a stretch. In recent years, humans have disturbed Titanosaurus, increasingly incurring his wrath. Though not specifically evil, Titanosaurus holds no allegiance to any particular ideology, and would not hesitate to secure additional power for himself should the opportunity arise. This frequently places himself in opposition to Earth Defenders and the Global Defense Force. Titanosaurus employs his towering height, powerful tail, and sonic waves to intimidate or subjugate any beings who dare to disrupt his ancient lifecycle."

Titanosaurus is the focus of issue #3 of IDW's miniseries Godzilla: Legends. In this issue, a psychic boy named Travis is enrolled in an academy for psychics run by Miki Saegusa and the mysterious Mugal. Travis unwittingly forms a psychic link with Titanosaurus and draws the monster to civilization, where he causes major destruction. It is later revealed that Mugal is a member of the Simeons, an alien race whose homeworld is dying. Mugal had intentionally manipulated Tristan to form a link with Titanosaurus so that the Simeons would be able to use Titanosaurus along with their fleet of Mechagodzillas to conquer Earth.

Titanosaurus first appears in Godzilla: Ongoing #4 attacking Tokyo, where he is attacked by Boxer and his "Kaiju Kill Crew." Rodan soon appears in the city and does battle with Titanosaurus. Boxer's team manages to detonate a building and topple it onto the two monsters. Rodan flies away, but Titanosaurus is captured and taken to Monster Island.

Later in issue #10, the now-free Titanosaurus joins forces with Battra and battles SpaceGodzilla in London. Despite the two Earth monsters' efforts, they are defeated and SpaceGodzilla escapes.

Titanosaurus, along with fellow monsters, Gezora and Manda attacked a fleet of aircraft carriers in the ocean. The attack was halted by Godzilla, who sent the three into retreat. Godzilla gave chase but couldn't catch up with them. It was revealed by Mothra's fairies that Titanosaurus and his two allies, were not actual alien kaiju, but were three water monsters that upheld the natural balance.

Titanosaurus was later seen being transported to new Monster Island, but joined the brawl between Godzilla, Gezora, Manda and the newly revived Destoroyah. The military intervened and sent the three aquatic monsters into retreat with a blast from their new sonar guns, only with Godzilla grabbing onto Titanosaurus' foot, dragging him down. Titanosaurus suffered a broken arm in the fight, also helping to destroy the Cryog spaceship, before retreating.

Trivia

The name "Titanosaurus" was also given to a sauropod dinosaur. In real life, the Titanosaurus was a four-legged herbivore and was not an aquatic creature.

With his colorful, dinosaurian design and (though weakly defined) personality, Titanosaurus is unique for a 1970's monster, most of which were space monsters with strange, unnatural and illogical body designs, and is an obvious throw-back to the more successful dinosaur monsters of the 1960's like Baragon and Gorosaurus.

Titanosaurus' fate is not known. After being weakened by Interpol's supersonic transmitter, the creature is hit directly in the chest by Godzilla's atomic ray, and falls backwards off of the cliff into the sea. It is unknown if Titanosaurus died in the battle, or recovered and swam away. Some believe that, since Titanosaurus was not among the monsters living in Monsterland in 1999, the creature did indeed perish. However, as the film Destroy All Monsters, which features Monsterland and takes place in 1999, was produced in 1968, seven years before Terror of MechaGodzilla was produced, this theory holds little water. After all, other monsters from films made before Destroy All Monsters, such as King Kong, the Giant Octopus and Ebirah are not seen living in Monsterland, either.

Godzilla and the INTERPOL agents with the Supersonic Wave Oscillator still tried to harm Titanosaurus after Katsura committed suicide, but due to her death, Titanosaurus' mind control would be broken, and thus reverted Titanosaurus back to his normal, harmless, state. It is possible that they were unaware that he was brainwashed and still thought that he was a threat.

In Godzilla: Final Wars, a boy is seen playing with Godzilla monster figures, including a toy figure of Titanosaurus.

In Godzilla: Unleashed, Titanosaurus only joins the mutants to stop the G.D.F. from attacking him. Some fans said that Titanosaurus should be an Earth defender in Godzilla: Unleashed instead of a mutant. This is because in the movie, he was being controlled, so he is not evil in the first place. At the same time, he has never defended the planet from alien attack or humans from mutant attacks like the other Earth Defenders. Furthermore, Titanosaurus has a sonic beam, which is ironic, considering that sonic energy is what lead to the downfall of his movie counterpart.

Titanosaurus is one of the few monsters that was beaten both by Godzilla and humans.